Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect IATS connector.
2. IG "ON" and ENG "OFF"
3. Measure voltage between terminal 4 of IATS harness connector and chassis ground.
  Specification: Approx. 5V
4. Is the measured voltage within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - If the voltage is 0V, go to " 3Check open in harness" as follows. If the voltage is more than 5.1V, go to " 2Check short to battery in harness" as follows.
Check short to battery in harness
1. IG "OFF" and disconnect IATS connector and PCM connector.
2. Measure resistance between terminals 2 and 4 of IATS harness connector.
3. Measure resistance between terminals 1 and 4 of IATS harness connector.
  Specification: Infinite
4. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair short to battery in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect IATS connector and PCM connector.
2. Measure resistance between terminal 4 of IATS harness connector and 44 of PCM harness connector.
  Specification: below 1Ω
3. Is the measured resistance within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Repair open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.